如何将UITableView中属于模型数组对象的数组中的数据显示给tableView？

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    var modelArray: [Model] = [] // 模型数组对象的数组
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化模型数组对象的数组
        modelArray = [Model1(), Model2(), Model3()]
        
        let tableView = UITableView(frame: view.bounds, style: .plain)
        tableView.dataSource = self
        tableView.delegate = self
        view.addSubview(tableView)
    }
    
    // MARK: - UITableViewDataSource
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return modelArray.count
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return modelArray[section].dataArray.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CustomTableViewCell
        
        let model = modelArray[indexPath.section]
        let data = model.dataArray[indexPath.row]
        
        cell.titleLabel.text = data.title
        cell.subtitleLabel.text = data.subtitle
        
        return cell
    }
    
    // MARK: - UITableViewDelegate
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        // 处理用户点击某一行的操作
    }
}

class Model {
    var dataArray: [Data] = []
}

class Model1: Model {
    override init() {
        super.init()
        dataArray = [Data(title: "Title1", subtitle: "Subtitle1"), Data(title: "Title2", subtitle: "Subtitle2")]
    }
}

class Model2: Model {
    override init() {
        super.init()
        dataArray = [Data(title: "Title3", subtitle: "Subtitle3"), Data(title: "Title4", subtitle: "Subtitle4")]
    }
}

class Model3: Model {
    override init() {
        super.init()
        dataArray = [Data(title: "Title5", subtitle: "Subtitle5"), Data(title: "Title6", subtitle: "Subtitle6")]
    }
}

class Data {
    var title: String
    var subtitle: String
    
    init(title: String, subtitle: String) {
        self.title = title
        self.subtitle = subtitle
    }
}

class CustomTableViewCell: UITableViewCell {
    let titleLabel = UILabel()
    let subtitleLabel = UILabel()
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        titleLabel.frame = CGRect(x: 20, y: 10, width: 200, height: 20)
        subtitleLabel.frame = CGRect(x: 20, y: 30, width: 200, height: 20)
        
        contentView.addSubview(titleLabel)
        contentView.addSubview(subtitleLabel)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}